Yes, stymy is a Scrabble word!
...and is worth 13 points in Scrabble, and 12 points in Words with Friends
stymy
Verb
1. Hinder or prevent the progress or accomplishment of
Noun
1. A situation in golf where an opponent's ball blocks the line between your ball and the hole
2. A thwarting and distressing situation
What Scrabble words can I make with the letters in stymy?
3 Letter Words
2 Letter Words